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2 years ago

Factor x^2-x-30 completely. If the poem polynomial cannot be factored, write “prime” show work

1 answer:

8 0

Answer:

(x+5)(x-6)

Explanation:

The way you can figure this out is by looking at which ones multiply to be 30, but add to be -1. If you were to make a list of what multiplies to be 30, you’d probably do:

30 • 1 = 30
10 • 3 = 30
2 • 15 = 30
5 • 6 = 30

In this case, the best possible answer would be “5 • 6 = 30.” Therefore, you would get:

(x 5)(x 6)

Now, you would have to determine what makes -1. In this case, the answer would be to put a “-“ for 6 and a “+” for 5 because -6 + 5 make -1.

(If you’re still unsure, you can FOIL what you factored.)

You might be interested in

If bolt thread length is normally distributed, what is the probability that the thread length of a randomly selected bolt is Wit

KatRina [158]

Answer:

a) 0.5762

b) 0.0214

c) 0.2718

Step-by-step explanation:

It is given that lengths of the bolt thread are normally distributed. So in order to find the required probability we can use the concept of z distribution and z scores.

Part a) Probability that length is within 0.8 SDs of the mean

We have to calculate the probability that the length of a bolt thread is within 0.8 standard deviations of the mean. Recall that a z- score tells us that how many standard deviations away a value is from the mean. So, indirectly we are given the z-scores here.

Within 0.8 SDs of the mean, means from a score of -0.8 to +0.8. i.e. we have to calculate:

P(-0.8 < z < 0.8)

We can find these values from the z table.

P(-0.8 < z < 0.8) = P(z < 0.8) - P(z < -0.8)

= 0.7881 - 0.2119

= 0.5762

Thus, the probability that the thread length of a randomly selected bolt is within 0.8 SDs of its mean value is 0.5762

Part b) Probability that length is farther than 2.3 SDs from the mean

As mentioned in previous part, 2.3 SDs means a z-score of 2.3.

2.3 Standard Deviations farther from the mean, means the probability that z scores is lesser than - 2.3 or greater than 2.3

i.e. we have to calculate:

P(z < -2.3 or z > 2.3)

According to the symmetry rules of z-distribution:

P(z < -2.3 or z > 2.3) = 1 - P(-2.3 < z < 2.3)

We can calculate P(-2.3 < z < 2.3) from the z-table, which comes out to be 0.9786. So,

P(z < -2.3 or z > 2.3) = 1 - 0.9786

= 0.0214

Thus, the probability that a bolt length is 2.3 SDs farther from the mean is 0.0214

Part c) Probability that length is between 1 and 2 SDs from the mean value

Between 1 and 2 SDs from the mean value can occur both above the mean and below the mean.

For above the mean: between 1 and 2 SDs means between the z scores 1 and 2

For below the mean: between 1 and 2 SDs means between the z scores -2 and -1

i.e. we have to find:

P( 1 < z < 2) + P(-2 < z < -1)

According to the symmetry rules of z distribution:

P( 1 < z < 2) + P(-2 < z < -1) = 2P(1 < z < 2)

We can calculate P(1 < z < 2) from the z tables, which comes out to be: 0.1359

So,

P( 1 < z < 2) + P(-2 < z < -1) = 2 x 0.1359

= 0.2718

Thus, the probability that the bolt length is between 1 and 2 SDs from its mean value is 0.2718

4 0

3 years ago

Write as a decimal: Explain... 1 7/12

hichkok12 [17]

Answer:

1 7/12 = 1.58

Step-by-step explanation:

If you divide 7 by 12, you will get 0.583... If you add 1 in the ones, that'll be

1.583... or 1.58.

6 0

3 years ago

I/3-2i + 2i/3+8i how do i do this

AVprozaik [17]

62/949+ 297i/949 is the answer to this problem

6 0

3 years ago

The ratio of the radii of two circles C1 and C2 is 1.5.

IRINA_888 [86]

Answer:

Below in bold.

Step-by-step explanation:

The circumference is one dimensional so the ratio is the same as the radii,

1.5.

The areas are 2 dimensional so the ratio is 1.5^2 = 2.25.

3 0

3 years ago

Estimate the quotient. Round your answer to the nearest whole number. 39.8 ÷ 4 ≈ ??

Tresset [83]

Answer:

Step-by-step explanation:

39.8/4=9.95, rounds to 10

5 0

3 years ago

Read 2 more answers